.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_modeling_gallery_spatial_plot_constant.py>`     to download the full example code
    .. rst-class:: sphx-glr-example-title

    .. _sphx_glr_modeling_gallery_spatial_plot_constant.py:


.. _constant-spatial-model:

Constant Spatial Model
======================

This model is a spatially constant model.

Example plot
------------
Here is an example plot of the model:


.. code-block:: default


    from gammapy.maps import WcsGeom
    from gammapy.modeling.models import (
        ConstantSpatialModel,
        Models,
        PowerLawSpectralModel,
        SkyModel,
    )

    geom = WcsGeom.create(npix=(100, 100), binsz=0.1)
    model = ConstantSpatialModel(value="42 sr-1")
    model.plot(geom=geom, add_cbar=True)




.. image:: /modeling/gallery/spatial/images/sphx_glr_plot_constant_001.png
    :alt: plot constant
    :class: sphx-glr-single-img





YAML representation
-------------------
Here is an example YAML file using the model:


.. code-block:: default


    pwl = PowerLawSpectralModel()
    constant = ConstantSpatialModel()

    model = SkyModel(spectral_model=pwl, spatial_model=constant, name="pwl-constant-model")
    models = Models([model])

    print(models.to_yaml())




.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    components:
    -   name: pwl-constant-model
        type: SkyModel
        spectral:
            type: PowerLawSpectralModel
            parameters:
            -   name: index
                value: 2.0
            -   name: amplitude
                value: 1.0e-12
                unit: cm-2 s-1 TeV-1
            -   name: reference
                value: 1.0
                unit: TeV
                frozen: true
        spatial:
            type: ConstantSpatialModel
            parameters:
            -   name: value
                value: 1.0
                unit: sr-1
                frozen: true






.. _sphx_glr_download_modeling_gallery_spatial_plot_constant.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: plot_constant.py <plot_constant.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: plot_constant.ipynb <plot_constant.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_